Granite-working machine



April 21, 1925.

E. A. CHASE GRANITE WORKING MACHINE Filed Feb, 11, 1921 2 Sheets-Sheet 1 April 21, 1925.

E. A. CHASE GRANITE WORKING MACHINE Filed Feb. 11, 1921 2 Sheets-Sheet 2 III! Patented Apr. 21, 1925.

UNITED STATES ELROY A. CHASE, OF NORTHFIELD, VERMONT.

GRANITE-WORKING MACHINE.

Application filed February 11. 1921. Serial No. 444,221.

To all whom it may concern:

Be it known that I, ELROY A. CHASE, a citizen of the United States, residing at Northfield, in the county of WVashington and State of Vermont, have invented a new and useful Granite-Working Machine, of which the following is a specification.

This invention relates to a granite working machine, and particularly to an improved tool for use therein. It is the general object of'my invention to provide a machine by which blocks of granite or similar stone may be quickly and economically provided with flat finished surfaces.

For this purpose I preferably support the block of granite in a chuck by which the stone is rotated during the finishing operation.

An important feature of my invention relatesto the provision of a novel and'very effective tool' for removing the surplus or waste stone from the face of the block. It is well understood in the'art that granite cannot be successfully subjectedto the action of cutting tools, like marble or other soft stone, but that it must be Worked with a "crushing or breaking process in which there is no substantial sliding movement between the work and the tool.

Accordingly, this feature of my invention relates particularly to*thepro-vision of an improved and novefgranite working tool so constructed that it will act by crushing or breaking rather than by cutting the stone.

' 'In the preferred form I provide a tool comprising a plurality o'fdiscs having beveled edges, and collectively mounted for free and independent rotation upon a movable 'tooi carrier. The discs are progressively 'inc'reas'ed'in size rearwardly from the stone and the spaces between the discs are likewise progressively increased, providing greater "clearance for the larger pieces of stone and to permit them to rotate freely and independently under all conditions.

My invention further relates to a construction whereby worn parts may be cheaply and readily replaced and to certain arrangements and combinations of parts which will be hereinafter described, and more particularly pointed out in the appended claims.

A preferred form' of my invention is shown in the drawings, in which Fig. 1 is a side elevation, partlyin section, of my improved granite working tool;

Fig. 2 is a. similar view of a modified construction, and

Fig. 8 is a plan view of a machine for which the tools of Figs. 1 or 2 are particularly adapted.

Referring first to Fig. 3, I will describe the general features of the granite working machine therein shown. I have shown a block of granite firmly'secured 'in' a chuck 10 mounted on the endof a shaft 11, rotatable in bearings 12 on a frame or'base 13. The shaft 11' may be rotated'in any convenient manner, as by a' belt 14: runnin over a pulley 15 on'the shaft 11. A too carriage 16 is mountedf slid (in i 8 and may be'adjusted thereon by ascrew '19 and hand wheel 20. 'The table 18 is movable on guides 21 in any convenient'inanner, as by a screw 22 which'may be rotated manually or automatically in any 'suitable manner. A second carriage "23"'may be mounted on the table 18 on which itistidjustable by a screw Elana. hand wheel 25. The carriage 23 supports a mo-tor'26 belted to a shaft 27 upon'which a' plura'lityof grinding or finishing wheels 28aresecured.

The tool carriage 16 is provided with a bearing 30 in which a shaft 31 ig. 1') is slidably but'non-rotatably mounted. A plurality of work engaging diSciS 32 33, '34:

and 35 are mounted to rotat efre'ely and in-"" dependently on the shaft 31, or preferably upon a bushing 36 fitting the end of the shaft 31. A head 37'is secured'to thee'nd of'the shaft 31 and is preferably provided for lubricating the disc bearings."

Thrust bearings are provided between 'each'pair ofadjac'ent" discs, these hearings being preferably of the ball bearing type. The discs 32 and 33 are located somewhat closely together and the discs '33 and '34 are spaced a little further apart by using larger balls in the bearing 40. Wider separation between the discs 34 and 35 is securedby 'with'an oil-hole 38 bv which oil 'i'ssup'plied the use of a spacing disc 41 in addition to the ball bearing 42. A ball bearing 43 is also for the disc the thrustbeing'ta eiiby a steelring 44 set'into the face of a flange 45 keyed to the shaft 4lbut slidable thereon. Adjusting and lock nuts 46 and 47 are threaded on the shaft 31 and may be used to adjust the shaft longitudinally, to provide exactly the right clearance between the discs so that theynfay rotate freely but 9s m t on flfhe'disos 33, 34 and 35 are provided with pbvele dledges and the small disc 32 is preferablyprovided with a double beveled edge, as shown in the drawings. permits the working diameter of this disc to be soiliettliatlar ger than would be thecase if the single" beveledj edge were em loyed.

, Theiaction jofthe cutting too 5 is clearly 1 and 2,' in which it appears that'theo'uter or larger disc 35 first engages the stock as show n, removin'g the surplus 's toclg therefrom in relatively large pieces. Theoth'er discs 34, 33 and 32 thereafter suci.ve a en e he .Swn an remove layers decreasingthickness from the face thereofithe discf32 removing a thin layer only,

,, ahd 'leavingja relatively smooth surface for ,iifge'fii e 'atiei f h di Wh l "imp ed to l in n 'pa s sa W ih lsuifface ioftheblock can thus remove four "suf'zifiessiv'e layers of material.

lnfFi'g. 2 I have shown'a modified conjstr tibnfin which the'smallest disc 50 is secured to the end of theshaft 51, which xtends; through a sleeve 52 rotatably ia6unaa hm t roller bearings 53 and g l lhe remaining discs rotate freely upon bushing 55 as in the form previously de- ';scribed. The operation ofthe tool is iden- By th e construction shown in either Fig. 1 or 2 the' cost of replacement is reduced to if 'fil almum,jaa he ushi gs 36 or 55 y s jort sections of ordinary pipe or tubing, upon which the hardened steel discs rotatefpract icallywithout wear, while the bushr n gmay be ver y easily and cheaply reenemas often as may be necessary.

, ,Ilief'provi'sion of ball or roller bearings between the discs is of great importance, as fit'permitsthe discs to rotate freely under iall' circumstances, no matter how great pressure they mayjsusta n. As the edge of the j'jdis'cs were be quickly destroyed by any relative sliding movement between the discs and the stone, this provision for free rounder all conditions is of greatest im- "rprehc LThe application of my improved granite working tool to a machine of the type shown in Fig. 3, enables me to secure a finished polished surface on a large block ofgnaniteat a single operation, and at a Very great reduction in time and labor.

scope of my invention as set forth in the claims, and I do not Wish to be otherwise limited to the details herein shown, but what, 1 claim is x 1. Aigranit e working tool comprising a start, a "plurality of work-engaging discs centered'on said shaft slidable axially thereon toward and from each other and each freely and independently rotatable in substantially radial planes about the axis of said shaft, and thrust bearingsbetween 'said discs to limit relative axial movement thereof. 7 a I 2. A granite working tool comprising a shaft, a plurality of discs centered on said shaft and each freely and independentlyrotatable in substantially radial planes about the'axis of said shaft, and antifriction devices engaging said discs at points removed from said shaft. 7 v w H v 3. A granite working tool comprising a shaft, a plurality of discs centered on said shaft and each freely andindependently rd tatable about the axis of said shaft, and anti-friction devices engaging said discs at points removed from said shaft, said discs having beveled working edges.

4. A granite Working tool comprising a shaft, a plurality of discs of unequal size each freely and independently rotatable about the axis of said shaft, and anti-friction devices engaging said discs at points remote from said shaft, said dis cs having beveled working edges and the smallest disc having a double beveled edge.

5; A granite working too-l comprising a shaft, and a plurality of discs each'freely and independently rotatable about the axis of said shaft, said discs being of unequal diameters and being axially separated from each other byspaces which increase progressively with the increased diameter of the discs which are sep-arated.

6. A granite working tool comprising a shaft, and a plurality of discs each freely and independently rotatable in substantially radial planes about the axis of said shaft, said discs being of unequal size and being unequally spaced from each other along the shaft with the larger discs more widely separated, and the wo1-ki1igedges of said discs defining a substantially conical structure.

7. A granite working tool comprising a shaft, a removable bushing on said shaft, a plurality of beveled discs freely and independently rotatable on said bushing, and anti-friction spacing devices between adjacent discs.

8. A granite Working tool comprising a shaft having a fixed head, a support in which said shaft is non-rotatably mounted, a flange slidable but non-rotatable on said shaft, a plurality of Work engaging discs rotatable on said shaft, anti-friction devices separating said discs from each other and from said flange, and means to adjust said shaft axially in its support.

9. A granite Working tool comprising a shaft having a head, a bushing removably mounted on said shaft, a plurality of Work engaging discs freely and independently rotatable on said bushing, and spacing devices between said discs, said discs increasing in diameter and in spacing rearward from the shaft head.

10. A granite Working tool comprising a shaft, and a plurality of substantially fiat circular stone-crushing discs centered on said shaft and freely and independently rotatable about the axis of said shaft, said discs increasing in relative diameter rearward from the outer end of said shaft.

In testimony whereof I have hereunto affixed my signature.

ELROY A. CHASE. 

